package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

/**
 * @author wuJiaWei
 * @version 1.0
 */
@Service
@Slf4j
public class UserServiceImpl implements UserService {
    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    // 微信服务接口地址
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";


    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenId(userLoginDTO);
        if (StringUtils.isBlank(openid)) {
            log.error("登录失败");
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);

        if(Objects.isNull(user)){
            //如果是新用户自动完成注册
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //返回用户对象
        return user;
    }

    private String getOpenId(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获取用户信息
        Map<String,String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        //判断openid是否为空，如果为空，则说明登录失败，抛出异常
        JSONObject jsonObject = JSON.parseObject(json);
        return jsonObject.getString("openid");
    }
}
